The document discusses effectual thinking and means-driven entrepreneurship. It provides examples of how William Kamkwamba started businesses using only the means and resources available to him. The document contrasts means-driven and goals-driven approaches, noting advantages of the means-driven approach include not having to wait for perfect opportunities or resources, and increasing opportunities for innovation and learning from failures. It also instructs readers to inventory their own means, knowledge, contacts, and resources as a first step in effectual entrepreneurship.